One in three American Indian women have been raped or have experienced an attempted rape, according to the Justice Department. Their rate of sexual assault is more than twice the national average. And no place, women’s advocates say, is more dangerous than Alaska’s isolated villages, where there are no roads in or out, and where people are further cut off by undependable telephone, electrical and Internet service.

The issue of sexual assaults on American Indian women has become one of the major sources of discord in the current debate between the White House and the House of Representatives over the latest reauthorization of the landmark Violence Against Women Act of 1994.

A Senate version, passed with broad bipartisan support, would grant new powers to tribal courts to prosecute non-Indians suspected of sexually assaulting their Indian spouses or domestic partners. But House Republicans, and some Senate Republicans, oppose the provision as a dangerous expansion of the tribal courts’ authority, and it was excluded from the version that the House passed last Wednesday. The House and Senate are seeking to negotiate a compromise.

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Reasons for the high rate of sexual assaults among American Indians are poorly understood, but explanations include a breakdown in the family structure, a lack of discussion about sexual violence and alcohol abuse.

Rape, according to Indian women, has been distressingly common for generations, and they say tribal officials and the federal and state authorities have done little to help halt it, leading to its being significantly underreported.